CN111724658A - Simple program-controlled variable alternating-current experimental power supply device - Google Patents
Simple program-controlled variable alternating-current experimental power supply device Download PDFInfo
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- CN111724658A CN111724658A CN201910223906.2A CN201910223906A CN111724658A CN 111724658 A CN111724658 A CN 111724658A CN 201910223906 A CN201910223906 A CN 201910223906A CN 111724658 A CN111724658 A CN 111724658A
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Abstract
The invention relates to the technical field of alternating-current experimental power supplies, and discloses a simple program-controlled variable alternating-current experimental power supply device which comprises an operation table, a three-phase regulating transformer, a device main switch and an output switch, wherein a rotary contact is arranged on the three-phase regulating transformer, the device main switch and the output switch are all installed on the operation table, the rotary contact of the three-phase regulating transformer is fixedly connected with a servo motor, the servo motor is connected with a device controller through a signal line, the device controller is electrically connected with the three-phase regulating transformer, the device main switch and the output switch, and the device controller is connected with a display through the signal line. The simple program-controlled variable alternating current experimental power supply device is convenient in voltage regulation and capable of visually seeing the state and parameters of equipment.
Description
Technical Field
The invention relates to the technical field of alternating current experimental power supplies, in particular to a simple program-controlled variable alternating current experimental power supply device.
Background
In various colleges and universities at different levels in China, a three-phase alternating current experiment is one of the electrician and electronic experiment projects which are necessary for college students in science and technology, and the existing experiment devices for the experiment are not limited to two types: one is to use completely separated instruments to assemble an experimental circuit by students, the other is to install related instruments and equipment on an electrical and electronic experiment table, and students only need to plug and connect wires according to the circuit. For example, the experimental items (pages 70 to 72) of "measurement of three-phase circuit voltage and current" in "teaching of electrotechnical and electronic practice" of experimental teaching material of colleges and universities, which is published by chemical industry publisher, 6 months 2003, are directly tested by using three-phase alternating current mains supply. However, the three-phase alternating current adopted in the two main experimental means is directly taken from the three-phase alternating current commercial power, and for the three-phase alternating current commercial power, the three-phase load of the whole power grid system is uncertain (the three-phase load is random at each moment, so that the three-phase load is unbalanced) and the internal resistance of the power supply system is not zero, so that the three-phase power is unbalanced and unstable, which is shown in the fact that the three-phase voltage is not equal and unstable, and the phase difference of the three-phase voltage is not 120 degrees or unstable. These all cause great error of experimental results and are even difficult to be tolerated by teachers and students. In addition, the voltage adjustment is troublesome, and the actual voltage can be measured by means of related instruments such as a voltmeter, so that the use is troublesome, the volume of the experimental device is large and heavy, and the occupied area is large.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a simple program-controlled variable alternating current experimental power supply device which has the advantages of convenient voltage regulation and capability of visually finding out the state and parameters of equipment, and solves the problems that in the prior art, the three-phase voltage is unstable, the voltage regulation is troublesome and the equipment parameters cannot be visually obtained.
(II) technical scheme
In order to realize the purposes of convenient pressure regulation and visual observation of equipment state and parameters, the invention provides the following technical scheme: the utility model provides a simple and easy programme-controlled variable alternating current experiment power supply unit, includes operation panel, three-phase regulating transformer, device master switch and output switch, be provided with rotary contact on the three-phase regulating transformer, device master switch and output switch all install on the operation panel, three-phase regulating transformer's rotary contact fixedly connected with servo motor, servo motor is connected with the device controller through the signal line, device controller and three-phase regulating transformer, device master switch and output switch electric connection, the device controller is connected with the display through the signal line.
Further, the device controller adopts an MPC5744 dual-core embedded microprocessor, and comprises two thirty-two bit FlexPWM modules and four independent AD conversion modules.
Furthermore, an automatic/manual switching handle is installed on the operating platform and is in signal connection with the device controller.
Further, install power indicator, operation pilot lamp and trouble lamp on the operation panel, power indicator and device master switch electric connection, operation pilot lamp and trouble lamp all with output switch electric connection.
Further, the device controller is connected with an RS232/485 and an Ethernet communication interface through a signal line.
Furthermore, the display adopts a color liquid crystal touch screen, and the display is installed on the operating console.
Furthermore, the device controller is electrically connected with a power input PT, an input CT, a voltage output PT and an output CT, the power input PT and the input CT are electrically connected with the device main switch, and the voltage output PT and the output CT are electrically connected with the output switch.
(III) advantageous effects
Compared with the prior art, the invention provides a simple program-controlled variable alternating current experimental power supply device, which has the following beneficial effects:
the simple program-controlled variable alternating-current experimental power supply device adopts a device controller capable of outputting PWM waveforms to output pulses, controls the rotating speed of a servo motor, drives a three-phase regulating transformer and outputs alternating-current voltage required by experiments. The equipment is provided with a display for adjusting parameters and configuration, and displaying the state and output parameters of the equipment in real time. The whole process adopts closed-loop control, the output voltage and current signals are fed back to the device controller in real time, an AD acquisition module arranged in the device controller carries out analog-to-digital conversion to calculate the current voltage and current values, the fed-back voltage values are compared with set values, the difference value is used as an input signal to carry out PID (proportion integration differentiation) regulation calculation to form variable frequency and pulse width control signals which are sent to a servo motor and control the rotating speed and the forward and reverse rotation of the servo motor to be transmitted to a rotary contact of a three-phase regulating transformer, so that the device outputs the required voltage to form a stable voltage output value. The device is provided with safety measures such as overvoltage protection, overcurrent protection, stroke feedback signals and the like, so that the device is ensured to run stably, safely and reliably.
Drawings
FIG. 1 is a system architecture diagram of a simple programmable variable AC experimental power supply apparatus according to the present invention;
FIG. 2 is a schematic diagram of the operation of a device controller in the simple programmable variable AC experimental power supply apparatus according to the present invention;
fig. 3 is a flowchart of the simple program-controlled variable ac experimental power supply device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a simple program-controlled variable ac experimental power supply device includes an operation desk, a three-phase voltage-regulating transformer, a main device switch and an output switch, wherein the three-phase voltage-regulating transformer is provided with a rotary contact, the three-phase voltage-regulating transformer, the main device switch and the output switch are all mounted on the operation desk, the rotary contact of the three-phase voltage-regulating transformer is fixedly connected with a servo motor, the servo motor is connected with a device controller through a signal line, the device controller is electrically connected with the three-phase voltage-regulating transformer, the main device switch and the output switch, the device controller is connected with a display through a signal line, during the experimental process, the device controller detects the input and output voltages and currents of the device in real time and calculates the input and output powers, and when the voltages, currents or powers exceed a safety range, the device sends an alarm, and the output switch and the input switch are cut off, so that the damage of equipment caused by overload or external short circuit of the equipment is avoided.
The device controller adopts an MPC5744 dual-core embedded microprocessor, the device controller comprises two thirty-two-position FlexPWM modules and four independent AD conversion modules, the device only needs to output 2 paths of high-precision pulse signals for controlling the rotation of a servo motor, one path of the high-precision pulse signals controls the forward rotation of a motor, and the other path of the high-precision pulse signals controls the reverse rotation of the motor, so that the effect of changing the number of turns of a secondary coil of a three-phase voltage regulating transformer is achieved.
The operating platform is provided with an automatic/manual switching handle which is in signal connection with the device controller and used for switching a manual pressure regulating mode, an automatic pressure regulating mode and a remote control pressure regulating mode.
The power indicator lamp, the operation indicator lamp and the fault indicator lamp are installed on the operating platform, the power indicator lamp is electrically connected with the main switch of the device, the operation indicator lamp and the fault indicator lamp are electrically connected with the output switch, when the device is powered on and the main switch is closed, the power indicator lamp is turned on, when the equipment outputs voltage or is in the processes of boosting and reducing the voltage, the operation indicator lamp is turned on, when the output voltage of the device exceeds a set value or the output current is checked to pass the set value, the device automatically and forcibly turns off the output, and a pulse signal is rapidly output, so that the servo motor drives the rotating contact of the three-phase adjustable transformer to return to a zero position.
The device controller is connected with an RS232/485 and an Ethernet communication interface through a signal wire, and can realize remote communication to control the voltage regulation output of the device in a remote control mode.
The display adopts a color liquid crystal touch screen, the display is arranged on an operation table and used for setting parameters such as PID parameters, overvoltage constant values, overcurrent constant values, voltage output set values, output time set values and the like, a user only needs to press down on a liquid crystal panel to start an experiment after setting target voltage and experimental voltage output time on the liquid crystal, and the device automatically starts to regulate the voltage and output according to the set parameters.
The device controller is also electrically connected with a power supply input PT, an input CT, a voltage output PT and an output CT, the power supply input PT and the input CT are electrically connected with a device main switch, and the voltage output PT and the output CT are electrically connected with an output switch.
In summary, a device controller capable of outputting PWM waveforms is adopted to output pulses, control the rotation speed of a servo motor, drive a three-phase voltage regulating transformer and output alternating current voltage required by experiments, a display is arranged on the device and is used for adjusting parameters and configuration, and displaying the state and output parameters of the device in real time, closed-loop control is adopted in the whole process, output voltage and current signals are fed back to the device controller in real time, an AD acquisition module arranged in the device controller carries out analog-to-digital conversion to calculate the current voltage and current values, the fed-back voltage values are compared with set values, the difference value is used as an input signal to carry out PID (proportion integration differentiation) regulation calculation to form variable frequency and pulse width control signals which are sent to the servo motor and control the rotation speed and positive and negative rotation of the servo motor to be transmitted to a rotary contact of the three-phase voltage regulating transformer, so that the device outputs, the device is provided with safety measures such as overvoltage protection, overcurrent protection, stroke feedback signals and the like, so that the device is ensured to run stably, safely and reliably.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a simple and easy programme-controlled variable alternating current experiment power supply unit, includes operation panel, three-phase regulating transformer, device master switch and output switch, the last rotary contact that is provided with of three-phase regulating transformer, its characterized in that: three-phase regulating transformer, device master switch and output switch all install on the operation panel, three-phase regulating transformer's rotary contact fixedly connected with servo motor, servo motor is connected with the device controller through the signal line, device controller and three-phase regulating transformer, device master switch and output switch electric connection, the device controller is connected with the display through the signal line.
2. The simple program-controlled variable alternating-current experimental power supply device according to claim 1, characterized in that: the device controller adopts a dual-core embedded microprocessor of MPC5744, and comprises two thirty-two bit FlexPWM modules and four independent AD conversion modules.
3. The simple program-controlled variable alternating-current experimental power supply device according to claim 1, characterized in that: and an automatic/manual switching handle is arranged on the operating platform and is in signal connection with the device controller.
4. The simple program-controlled variable alternating-current experimental power supply device according to claim 1, characterized in that: the operating table is provided with a power indicator lamp, an operation indicator lamp and a fault indicator lamp, the power indicator lamp is electrically connected with the device main switch, and the operation indicator lamp and the fault indicator lamp are electrically connected with the output switch.
5. The simple program-controlled variable alternating-current experimental power supply device according to claim 1, characterized in that: the device controller is connected with an RS232/485 and an Ethernet communication interface through a signal wire.
6. The simple program-controlled variable alternating-current experimental power supply device according to claim 1, characterized in that: the display adopts colored liquid crystal touch screen, the display is installed on the operation panel.
7. The simple program-controlled variable alternating-current experimental power supply device according to claim 1, characterized in that: the device controller is also electrically connected with a power input PT, an input CT, a voltage output PT and an output CT, the power input PT and the input CT are electrically connected with a device main switch, and the voltage output PT and the output CT are electrically connected with an output switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910223906.2A CN111724658A (en) | 2019-03-22 | 2019-03-22 | Simple program-controlled variable alternating-current experimental power supply device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910223906.2A CN111724658A (en) | 2019-03-22 | 2019-03-22 | Simple program-controlled variable alternating-current experimental power supply device |
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| CN111724658A true CN111724658A (en) | 2020-09-29 |
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| CN201910223906.2A Pending CN111724658A (en) | 2019-03-22 | 2019-03-22 | Simple program-controlled variable alternating-current experimental power supply device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122526A (en) * | 1994-11-03 | 1996-05-15 | 张树华 | Three-phase and Single phase voltage stabilizer with rms value converter |
| CN203352452U (en) * | 2013-07-26 | 2013-12-18 | 中国化学工程第七建设有限公司 | Novel alternating-current voltage-regulation stabilization digital power supply |
| CN105118360A (en) * | 2015-06-17 | 2015-12-02 | 浙江求是科教设备有限公司 | Modern power electronic technique experiment platform and method |
| CN207352094U (en) * | 2017-10-26 | 2018-05-11 | 广州赛睿检测设备有限公司 | Three-phase alternating current capacitor durability test equipment |
| CN108957193A (en) * | 2018-08-01 | 2018-12-07 | 浙江方圆电气设备检测有限公司 | A kind of self-regulation power supply and transformer device for testing temperature rise |
-
2019
- 2019-03-22 CN CN201910223906.2A patent/CN111724658A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122526A (en) * | 1994-11-03 | 1996-05-15 | 张树华 | Three-phase and Single phase voltage stabilizer with rms value converter |
| CN203352452U (en) * | 2013-07-26 | 2013-12-18 | 中国化学工程第七建设有限公司 | Novel alternating-current voltage-regulation stabilization digital power supply |
| CN105118360A (en) * | 2015-06-17 | 2015-12-02 | 浙江求是科教设备有限公司 | Modern power electronic technique experiment platform and method |
| CN207352094U (en) * | 2017-10-26 | 2018-05-11 | 广州赛睿检测设备有限公司 | Three-phase alternating current capacitor durability test equipment |
| CN108957193A (en) * | 2018-08-01 | 2018-12-07 | 浙江方圆电气设备检测有限公司 | A kind of self-regulation power supply and transformer device for testing temperature rise |
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Application publication date: 20200929 |
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